Which of the following is true? A. Entropy approaches a constant value as temperature approaches absolute zero. B. Isothermal mixing of gases does not involve a change in enthalpy.   C. An increase in entropy of the system must be observed in a condensation process.   D. The entropy of all substances at absolute zero is zero.     What is the maximum efficiency of a heat engine operating between a hot heat reservoir at 800 K and a cold heat reservoir at 300 K? A. 0.375 B. 0.750   C. 0.625   D. 0.500

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Which of the following is true?

A. Entropy approaches a constant value as temperature approaches absolute zero.

B. Isothermal mixing of gases does not involve a change in enthalpy.
 
C. An increase in entropy of the system must be observed in a condensation process.
 
D. The entropy of all substances at absolute zero is zero.
 
 

What is the maximum efficiency of a heat engine operating between a hot heat reservoir at 800 K and a cold heat reservoir at 300 K?

A. 0.375

B. 0.750
 
C. 0.625
 
D. 0.500
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